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The final power amplifier stage of a transmitter must be connected to a correctly matched transmission line and antenna to avoid possible damage to the transmitter/feed line and interference to other radio communications services.

The matching can be done by ensuring that all parts of the circuit have the same resistance or by transforming the voltage current ratio to eliminate the mismatch.

An antenna matching unit (often called an antenna tuner) can be used to eliminate the mismatch.

A clear path is better to increase signal strength than an increase in power of 10 or 100 times.

For example a satellite can be reached with only a few watts if there are no obstructions whereas a signal travelling 5 -10 kms through trees and buildings will be almost unreadable. An increase antenna height will beat an increase in power.